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Gravitational waves from extreme mass ratio inspirals: challenges in mapping the spacetime of massive, compact objects

Scott A Hughes

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In its final year of inspiral, a stellar mass (1-10 Modot) body orbits a massive (105-107 Modot) compact object about 105 times, spiralling from several Schwarzschild radii to the last stable orbit. These orbits are deep in the massive object's strong field, so the gravitational waves that they produce probe the strong-field nature of the object's spacetime. Measuring these waves can, in principle, be used to `map' this spacetime, allowing observers to test whether the object is a black hole or something more exotic. Such measurements will require a good theoretical understanding of wave generation during inspiral. In this paper, I discuss the major theoretical challenges standing in the way of building such maps from gravitational-wave observations, as well as recent progress in producing extreme mass ratio inspirals and waveforms.


PACS

04.30.-w Gravitational waves

04.70.-s Physics of black holes

MSC

83C57 Black holes

83C35 Gravitational waves

Subjects

Gravitation and cosmology

Dates

Issue 19 (7 October 2001)

Received 5 July 2001

Published 17 September 2001



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